/**
 * <copyright> Copyright 2006 by Know-Center, Graz, Austria </copyright>
 * PDF-AS has been contracted by the E-Government Innovation Center EGIZ, a
 * joint initiative of the Federal Chancellery Austria and Graz University of
 * Technology.
 *
 * Licensed under the EUPL, Version 1.1 or - as soon they will be approved by
 * the European Commission - subsequent versions of the EUPL (the "Licence");
 * You may not use this work except in compliance with the Licence.
 * You may obtain a copy of the Licence at:
 * http://www.osor.eu/eupl/
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the Licence is distributed on an "AS IS" basis,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the Licence for the specific language governing permissions and
 * limitations under the Licence.
 *
 * This product combines work with different licenses. See the "NOTICE" text
 * file for details on the various modules and licenses.
 * The "NOTICE" text file is part of the distribution. Any derivative works
 * that you distribute must include a readable copy of the "NOTICE" text file.
 *
 * $Id: TextualSignator_1_0_0.java,v 1.3 2006/10/31 08:07:50 wprinz Exp $
 */
package at.gv.egiz.pdfas.impl.signator.detached;

import java.io.IOException;
import java.io.OutputStream;
import java.io.OutputStreamWriter;

import at.gv.egiz.pdfas.exceptions.ErrorCode;
import at.gv.egiz.pdfas.exceptions.framework.SignatorException;
import at.gv.egiz.pdfas.framework.SignatorFactory;
import at.gv.egiz.pdfas.framework.output.DataSink;
import at.gv.egiz.pdfas.framework.signator.SignatorInformation;
import at.gv.egiz.pdfas.impl.signator.textual.TextualSignatorInformation;
import at.gv.egiz.pdfas.impl.signator.textual.TextualSignator_1_0_0;
import at.knowcenter.wag.egov.egiz.PdfASID;
import at.knowcenter.wag.egov.egiz.sig.connectors.bku.BKUPostConnection;

/**
 * Signs a document textually.
 * 
 * <p>
 * In prepareSign, the document text is extracted and normalized.
 * </p>
 * <p>
 * In finishSign, the signed SignatureObject is transformed into a Signature
 * block, which is then written as an Incremental Update.
 * </p>
 * 
 * @author wprinz
 */
public class DetachedTextualSignator_1_0_0 extends TextualSignator_1_0_0
{
  /**
   * The Mime Type.
   */
  public static final String MIME_TYPE = "text/xml"; //$NON-NLS-1$

  /**
   * The Pdf-AS ID of this Signator.
   */
  public static final PdfASID MY_ID = new PdfASID(SignatorFactory.VENDOR, SignatorFactory.TYPE_DETACHED_TEXTUAL, SignatorFactory.VERSION_1_0_0);

  /**
   * @see at.knowcenter.wag.egov.egiz.framework.Signator#getMyId()
   */
  public PdfASID getMyId()
  {
    return MY_ID;
  }

  // /**
  // * <p>
  // * The parameter has_SIG_ID is not used by this Signator because it doesn't
  // * pre-format the signature block.
  // * </p>
  // *
  // * @see at.knowcenter.wag.egov.egiz.framework.Signator#prepareSign(byte[],
  // * String, TablePos, boolean)
  // */
  // public IncrementalUpdateInformation prepareSign(PdfDataSource pdf,
  // String signature_type, TablePos pos, boolean has_SIG_ID) throws
  // PresentableException
  // {
  // IncrementalUpdateInformation iui = new IncrementalUpdateInformation();
  // iui.original_document = pdf;
  // iui.signature_type = signature_type;
  // iui.pos = pos;
  //
  // String document_text =
  // PdfAS.extractNormalizedTextTextual(pdf.createInputStream());
  // // logger_.debug("signed_text = " + document_text);
  //    
  // DataSource ds = new TextDataSourceImpl(document_text);
  // iui.signature_data = new SignatureDataImpl(ds, MIME_TYPE, "UTF-8");
  // //$NON-NLS-1$ //$NON-NLS-2$
  //
  // return iui;
  // }
  //
  // /**
  // * @see
  // at.knowcenter.wag.egov.egiz.framework.Signator#finishSign(at.knowcenter.wag.egov.egiz.pdf.IncrementalUpdateInformation)
  // */
  // public SignResult finishSign(IncrementalUpdateInformation iui) throws
  // PresentableException
  // {
  // try
  // {
  // String response =
  // iui.signed_signature_object.response_properties.getProperty(BKUPostConnection.RESPONSE_STRING_KEY);
  // byte[] response_bytes = response.getBytes("UTF-8"); //$NON-NLS-1$
  //
  // SignResult sign_result = new SignResult(MIME_TYPE, response_bytes);
  // return sign_result;
  // }
  // catch (UnsupportedEncodingException e)
  // {
  // e.printStackTrace();
  // throw new PDFDocumentException(300, e);
  // }
  // }

  /**
   * @see at.gv.egiz.pdfas.impl.signator.textual.TextualSignator_1_0_0#finishSign(at.gv.egiz.pdfas.framework.signator.SignatorInformation,
   *      at.gv.egiz.pdfas.framework.output.DataSink)
   */
  public void finishSign(SignatorInformation signatorInformation, DataSink dataSink) throws SignatorException
  {
    try
    {
      TextualSignatorInformation tsi = (TextualSignatorInformation) signatorInformation;

      String response = tsi.signSignatureObject.response_properties.getProperty(BKUPostConnection.RESPONSE_STRING_KEY);

      OutputStream os = dataSink.createOutputStream(MIME_TYPE, "UTF-8");
      OutputStreamWriter osw = new OutputStreamWriter(os);
      osw.write(response);
      osw.close();
    }
    catch (IOException e)
    {
      throw new SignatorException(ErrorCode.SIGNATURE_COULDNT_BE_CREATED, e);
    }
  }

}